Write 20 physical Quntities and there units
Answers
The first table lists the base quantities used in the International System of Units to define the physical dimension of physical quantities for dimensional analysis. The second table lists the derived physical quantities. Derived quantities can be mentioned in terms of the base quantities.
This is a list of physical quantities.
Note that neither the names nor the symbols used for the physical quantities are international standards. Some quantities are known as several different names such as the magnetic B-field which known as the magnetic flux density, the magnetic induction or simply as the magnetic field depending on the context. Similarly, surface tension can be denoted by either σ, γ or T. The table usually lists only one name and symbol.
The final column lists some special properties that some of the quantities have, such as their scaling behavior (i.e. whether the quantity is intensive or extensive), their transformation properties (i.e. whether the quantity is a scalar, vector or tensor), and whether the quantity is conserved.
Explanation:
Base quantitySymbolDescriptionSI base unitDimensionCommentsLengthlThe one-dimensional extent of an objectmetre (m)LextensiveMassmA measure of resistance to accelerationkilogram (kg)Mextensive, scalarTimetThe duration of an eventsecond (s)TscalarElectric CurrentIRate of flow of electrical charge per unit timeampere (A)IextensiveTemperatureTAverage kinetic energy per degree of freedom of a systemkelvin (K)Θintensive, scalarAmount of substancenThe quantity proportional to the number of particles in a sample, with the Avogadro constant as the proportionality constantmole (mol)Nextensive, scalarLuminous intensityIvWavelength-weighted power of emitted light per unit solid anglecandela (cd)Jscalar
This list is incomplete; you can help by expanding it.
Derived quantitySymbolDescriptionSI derived unitDimensionCommentsAbsementAMeasure of sustained displacement: the first integral with respect to time of displacementm⋅sL TvectorAbsorbed dose rateAbsorbed dose received per unit of timeGy/sL2 T−3Accelerationa→Rate of change of velocity per unit time: the second time derivative of positionm/s2L T−2vectorAngular accelerationωaChange in angular velocity per unit timerad/s2T−2Angular momentumLMeasure of the extent and direction an object rotates about a reference pointkg⋅m2/sM L2 T−1conserved, bivectorAngular velocityωThe angle incremented in a plane by a segment connecting an object and a reference point per unit timerad/sT−1bivectorAreaAExtent of a surfacem2L2extensive, bivector or scalarArea densityρAMass per unit areakg⋅m−2M L−2intensiveCapacitanceCStored charge per unit electric potentialfarad (F = C/V)M−1 L−2 T4 I2scalarCatalytic activity concentrationChange in reaction rate due to presence of a catalyst per unit volume of the systemkat⋅m−3L−3 T−1 NintensiveChemical potentialμEnergy per unit change in amount of substanceJ/molM L2 T−2 N−1intensiveCracklec→Change of jounce per unit time: the fifth time derivative of positionm/s5L T−5vectorCurrent densityJ →Electric current per unit cross-section areaA/m2L−2 Iconserved, intensive, vectorDose equivalentHReceived radiation adjusted for the effect on biological tissuesievert (Sv = m2/s2)L2 T−2intensiveDynamic viscosityvMeasure for the resistance of an incompressible fluid to stressPa⋅sM L−1 T−1intensiveElectric chargeQThe force per unit electric field strengthcoulomb (C = A⋅s)T Iextensive, conservedElectric charge densityρQElectric charge per unit volumeC/m3L−3 T IintensiveElectric displacement fieldD→Strength of the electric displacementC/m2L−2 T Ivector fieldElectric field strengthE→Strength of the electric fieldV/mM L T−3 I−1vector fieldElectrical conductanceGMeasure for how easily current flows through a materialsiemens (S = Ω−1)M−1 L−2 T3 I2scalarElectrical conductivityσMeasure of a material's ability to conduct an electric currentS/mM−1 L−3 T3 I2scalarElectric potentialφEnergy required to move a unit charge through an electric field from a reference pointvolt (V = J/C)M L2 T−3 I−1extensive, scalarElectrical resistanceRElectric potential per unit electric currentohm (Ω = V/A)M L2 T−3 I−2extensive, scalar, assumes linearityElectrical resistivityρeBulk property equivalent of electrical resistanceohm-metre (Ω⋅m)M L3 T−3 I−2extensive, scalar, conservedEnergyEEnergyJM L2 T−2Energy densityρEEnergy per unit volumeJ⋅m−3M L−1 T−2intensiveEntropySLogarithmic measure of the number of available states of a systemJ/KM L2 T−2 Θ−1extensive, scalarForceF→Transfer of momentum per unit timenewton (N = kg⋅m⋅s−2)M L T−2extensive, vectorFrequencyfNumber of (periodic) occurrences per unit timehertz (Hz = s−1)T−1scalarHalf-lifet1/2Time for a quantity to decay to half its initial valuesTHeatQThermal energyjoule (J)M L2 T−2Heat capacityCpEnergy per unit temperature changeJ/KM L2 T−2 Θ−1extensiveHeat flux densityϕQHeat flow per unit time per unit surface areaW/m2M T−3IlluminanceEvLuminous flux per unit surface arealux (lx = cd⋅sr/m2)L−2 JImpedanceZResistance to an alternating current of a given frequency, including effect on phaseohm (Ω)M L2 T−3 I−2complex scalar